Usage:
Jefferson City Dolomite (AR*,IL*,MO*)
Jefferson City Dolomite of Arbuckle Group (OK*, and KS*-subsurface)
Cotter Dolomite and Jefferson City Dolomite, undifferentiated (AR, and KS-subsurface)
Cotter Formation and Jefferson City Formation, undifferentiated (AR)
Geologic age:
Early Ordovician (Canadian; Ibexian; Jeffersonian)*
Type section, locality, area and/or origin of name:
Type section (composite): sections along south bluffs of Missouri River valley, beginning east of Jefferson City at mouth of Moreau River, northwest corner of sec. 24 or southwest corner of sec. 13, T. 44 N., R. 11 W., Osage City 7.5-min quadrangle, and extending west-northwest to mouth of Grays Creek, west of Jefferson City, center sec. 35, T. 45 N., R. 12 W., Jefferson City 7.5-min quadrangle, Cole Co., MO (in 1894 possibly located at SW/4 SE/4 sec. 27, T. 45 N., R. 12 W.) (Winslow, 1894; Thompson, 1991).
Reference sections: (1) New construction on U.S. Highway 50, T. 44 N., R. 11 E., Cole Co., central MO; and (2) new roadcut on U.S. Highway 63 immediately south of Westphalia, SW/4 NE/4 sec. 35 and SW/4 sec. 36, T. 43 N., R. 10 W., Westphalia East 7.5-min quadrangle, Osage Co., MO (Thompson, 1991).
AAPG geologic province:
Anadarko basin*
Arkoma basin*
Central Kansas uplift*
Cherokee basin*
Chautauqua platform*
Forest City basin*
Illinois basin*
Nemaha anticline*
Ozark uplift*
Salina basin*
Upper Mississippi embayment*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).